TPA311 350-mW LOW-VOLTAGE AUDIO POWER AMPLIFIER

SLOS207 - JANUARY 1998

features

• Fully Specified for 3.3-V and 5-V Operation
• Wide Power Supply Compatibility 2 V - 5.5 V
• Output Power for R_L = 8
  • 350 mW at V_DD = 5 V, BTL
  • 250 mW at V_DD = 5 V, SE
  • 250 mW at V_DD = 3.3 V, BTL
  • 75 mW at V_DD = 3.3 V, SE
• Shutdown Control
  • I_DD = 7 uA at 3.3 V
  • I_DD = 60 uA at 5 V
• BTL to SE Mode Control
• Integrated Depop Circuitry
• Thermal and Short-Circuit Protection
• Surface Mount Packaging

description

The TPA311 is a bridge-tied load (BTL) or single-ended (SE) audio power amplifier developed especially for low-voltage applications where internal speakers and external earphone operation is required. Operating with a 3.3-V supply, the TPA311 can deliver 250-mW of continuous power into a BTL 8- load at less

than 1% THD+N throughout voice band frequencies. Although this device is characterized out to 20 kHz, its operation was optimized for narrower band applications such as cellular communications. The BTL configuration eliminates the need for external coupling capacitors on the output in most applications, which is particularly important for small battery-powered equipment. A unique feature of the TPA311 is that it allows the amplifier to switch from BTL to SE on the fly when an earphone drive is required. This eliminates complicated mechanical switching or auxiliary devices just to drive the external load. This device features a shutdown mode for power-sensitive applications with special Depop circuitry to eliminate speaker noise when exiting shutdown mode. The TPA311 is available in an 8-pin SOIC surface-mount package that reduces board space and facilitates automated assembly.

View more information about generic part numbers:TPA311

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.

(c) Copyright 1998 Texas Instruments Incorporated. All rights reserved.
Trademarks, Important Notice!